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This content comes from Closed Captioning that was broadcast along with this program.

>>>nbc's
kelly
o'donnell who, as our
capitol hill
correspondent of course has been covering the government shutdown, found herself locked down with everybody else during the height of today's emergency.
kelly
, good evening.

>> reporter: good evening, brian. the political drama was quickly, abruptly overtaken by this. the
capitol dome
is off to my left. i am on a balcony of a senate
office building
. below me is one of the street where is the chase took place. and the lights behind me, that will show you where the car is now in what officials are calling the second
crime scene
. this was scary for visitors and for lawmakers, staffers and media this was a workplace emergency. on a summer -- like october day, sudden fear. visitors be gan to flee.

>>i heard four or five gunshots. then this whole swarm of
police cars
, 20, maybe more.

>>as soon as you heard those it was -- on.

>> reporter: my colleague
luke russert
.

>>i'm looking out the window. tourists are being told to run away.

>> reporter: explaining what he saw as it happened.

>>i looked out the window. i saw 40 or 50 tourists hit the ground, all laying down.

>>police surrounded the vehicles, had their guns drawn, had the passenger door open telling the person to get out.

>> reporter: senators who rushed back inside.

>>there is an ambulance that's now responded.

>> reporter: were witnesses to the chaos.

>>we heard pops. three, four, five probably. i don't know if they were shots or not.

>> reporter: a frantic energy took over. an alarm sounded with these ominous words. "report of gunfire."

>>there is a report of gunfire on
capitol hill
.

>>these are live pictures.
kelly
, are you there?

>>i am, tamron. we are under lock down.

>> reporter: i snapped a photo of the warning as it flashed on the screens inside the
capitol building
. the spokesman says there are reports of injured
u.s. capitol police
officers. working to find out more for you. one officer was injured in a
car crash
in what police are calling the first
crime scene
. at the second location visitors saw a face-off.

>>they had the passenger door open. their gun was pointed directly in.

>> reporter: roughly 40 minutes later, for those of us working inside, the relief of an all-clear senate and house are both re-opened.

>>majority leader
harry reid
, himself a former
capitol police
officer, re open ed the senate floor with a message from that injured officer.

>> reporter: he's hurt. but he said -- i'm pa are a phrasing, but not much. he said, i work every day to make sure you are safe.

>>that was sustained applause certainly. i can tell you both the house and senate will get back to their normal business tomorrow. the investigation goes on. again, one
u.s. capitol police
officer, one
secret service
agent also were injured. what we can tell you is there is a return to normal, but, boy, has it been one heck of a day. brian?